docstr: This is called at the beginning of the optimization procedure.
docstr_tok: ["This","is","called","at","the","beginning","of","the","optimization","procedure","."]
code: def optimization_about_to_start(self):
      """This is called at the beginning of the optimization procedure."""
  
file_path: openTSNE/openTSNE/callbacks.py
imports: import logging
  from functools import partial
  import numpy
  from scipy.sparse import csr_matrix
  from openTSNE import kl_divergence
  from openTSNE.tsne import TSNEEmbedding
label_desc: Use image node_id 1 for calling the Callback obj's underlying member method code with example usage: obj.optimization_about_to_start() without return types